* {
  box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  background: #f0f4f8;
  color: #333;
  display: flex;
  min-height: 100vh;
  justify-content: center;
  align-items: center;
  padding: 10px;
}
#app {
  background: white;
  max-width: 400px;
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
  padding: 20px 30px;
}
h1, h2, h3 {
  text-align: center;
  color: #1976d2;
  margin-bottom: 16px;
}
input[type=text],
input[type=email],
input[type=password],
input[type=number] {
  width: 100%;
  padding: 10px 12px;
  margin: 8px 0 16px;
  border-radius: 8px;
  border: 1px solid #ccc;
  font-size: 1rem;
}
button {
  cursor: pointer;
  background-color: #1976d2;
  color: white;
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-weight: 600;
  font-size: 1rem;
  width: 100%;
  margin: 12px 0;
  transition: background-color 0.3s ease;
}
button:hover {
  background-color: #004ba0;
}
.error {
  color: crimson;
  font-weight: 600;
  margin-bottom: 12px;
  text-align: center;
}
#booking-list {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 12px;
  font-size: 0.95rem;
  background: #f9fbfd;
}
.booking-item {
  border-bottom: 1px solid #ddd;
  padding: 8px 0;
}
.booking-item:last-child {
  border-bottom: none;
}
#logout-btn {
  background: #d32f2f;
  margin-bottom: 20px;
}
a {
  color: #1976d2;
  cursor: pointer;
  text-decoration: underline;
}
a:hover {
  color: #004ba0;
}
@media (max-width: 600px) {
  #app {
    max-width: 100%;
    padding: 20px;
    border-radius: 0;
    height: 100vh;
    overflow-y: auto;
  }
}
